LONG-TERM LABORATORY AND FIELD BEHAVIOR OF PPA ASPHALT CEMENT BLENDS

This paper summarizes an eight-year research effort on the role of Propane-Precipitated Asphalt (PPA) in paving asphalt cement blends, and its effect on asphalt, bituminous mixtures, and actual pavement behavior. The concept of extended aging in the temperature-time domain under laboratory conditions is presented for studying the aging of paving-grade asphalts as diverse in the method of their manufacture as straight-run asphalts and propane-precipitated blends. Compositional analysis was used successfully to evaluate the extent of change in asphalt chemical and colloidal composition during aging, and how these alterations relate to the rheological behavior of material. The peculiar laboratory characteristics of the PPA blends and the merits of using one type of asphalt as against another required field performance indicators.

Language

  • English

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Filing Info

  • Accession Number: 00728539
  • Record Type: Publication
  • Files: TRIS, ATRI
  • Created Date: Nov 6 1996 12:00AM